Incorrect description generation for mutation arguments

[bridges-wood]

Which packages are impacted by your issue?

@graphql-codegen/typescript-type-graphql

Describe the bug

When annotating the arguments of a mutation, the generator outputs [object Object] rather than the description as expected.

Your Example Website or App

https://codesandbox.io/p/devbox/winter-worker-l82rkv?file=%2Ftypes.ts%3A41%2C63-41%2C76

Steps to Reproduce the Bug or Issue

1. Run generate

Expected behavior

As a user I expect the descriptions of arguments on mutations to be correctly generated but they are not.

Screenshots or Videos

No response

Platform

• OS: macOS
• NodeJS: 20.9.0
• graphql version: 16.8.1
• @graphql-codegen/* version(s): 3.0.0 (@graphql-codegen/typescript-type-graphql)

Codegen Config File

No response

Additional context

No response